Forward-compatibility stubs

Change-Id: I9c5bf5ce38827ced91d8912a1fa49adbd14a46b8

5 files changed, 138 insertions, 0 deletions

diff --git a/Android.mk b/Android.mk
index 08cf6f8..613a90f 100644
--- a/Android.mk
+++ b/Android.mk
@@ -108,6 +108,7 @@ LOCAL_SRC_FILES:= \
 	src/core/SkGeometry.cpp \
 	src/core/SkGlyphCache.cpp \
 	src/core/SkGraphics.cpp \
+	src/core/SkLanguage.cpp \
 	src/core/SkLineClipper.cpp \
 	src/core/SkMallocPixelRef.cpp \
 	src/core/SkMask.cpp \
diff --git a/include/core/SkLanguage.h b/include/core/SkLanguage.h
new file mode 100644
index 0000000..923008e
--- /dev/null
+++ b/include/core/SkLanguage.h
@@ -0,0 +1,70 @@
+
+/*
+ * Copyright 2012 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#ifndef SkLanguage_DEFINED
+#define SkLanguage_DEFINED
+
+#include "SkTypes.h"
+
+#ifdef SK_BUILD_FOR_ANDROID
+
+#include "SkString.h"
+
+struct SkLanguageInfo {
+    SkLanguageInfo(const char* tag) : fTag(tag) { }
+    SkString fTag; //! BCP 47 language identifier
+};
+
+/** \class SkLanguage
+
+    The SkLanguage class represents a human written language, and is used by
+    text draw operations to determine which glyph to draw when drawing
+    characters with variants (ie Han-derived characters).
+*/
+class SkLanguage {
+public:
+    SkLanguage() : fInfo(getInfo("")) { }
+    SkLanguage(const char* tag) : fInfo(getInfo(tag)) { }
+    SkLanguage(const SkLanguage& b) : fInfo(b.fInfo) { }
+
+    /** Gets a BCP 47 language identifier for this SkLanguage.
+        @return a BCP 47 language identifier representing this language
+    */
+    const SkString& getTag() const { return fInfo->fTag; }
+
+    /** Performs BCP 47 fallback to return an SkLanguage one step more general.
+        @return an SkLanguage one step more general
+    */
+    SkLanguage getParent() const;
+
+    bool operator==(const SkLanguage& b) const {
+        return fInfo == b.fInfo;
+    }
+    bool operator!=(const SkLanguage& b) const {
+        return fInfo != b.fInfo;
+    }
+    bool operator<(const SkLanguage& b) const {
+        return fInfo < b.fInfo;
+    }
+    bool operator>(const SkLanguage& b) const {
+        return fInfo > b.fInfo;
+    }
+    SkLanguage& operator=(const SkLanguage& b) {
+        fInfo = b.fInfo;
+        return *this;
+    }
+
+private:
+    const SkLanguageInfo* fInfo;
+
+    static const SkLanguageInfo* getInfo(const char* tag);
+};
+
+#endif // #ifdef SK_BUILD_FOR_ANDROID
+#endif // #ifndef SkLanguage_DEFINED
diff --git a/include/core/SkPaint.h b/include/core/SkPaint.h
index 0ec6698..9e12ece 100644
--- a/include/core/SkPaint.h
+++ b/include/core/SkPaint.h
@@ -15,6 +15,10 @@
 #include "SkXfermode.h"
 #include "SkString.h"
 
+#ifdef SK_BUILD_FOR_ANDROID
+#include "SkLanguage.h"
+#endif
+
 class SkAutoGlyphCache;
 class SkColorFilter;
 class SkDescriptor;
@@ -665,6 +669,11 @@ public:
         @param locale set the paint's locale value for drawing text.
     */
     void    setTextLocale(const SkString& locale);
+
+    /** Set the paint's language value used for drawing text.
+        @param language set the paint's language value for drawing text.
+    */
+    void setLanguage(const SkLanguage& language);
 #endif
 
     /** Return the paint's text size.
diff --git a/src/core/SkLanguage.cpp b/src/core/SkLanguage.cpp
new file mode 100644
index 0000000..3b8ba3c
--- /dev/null
+++ b/src/core/SkLanguage.cpp
@@ -0,0 +1,54 @@
+
+/*
+ * Copyright 2012 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkLanguage.h"
+
+#ifdef SK_BUILD_FOR_ANDROID // currently only for Android
+
+#include "SkTDict.h"
+#include "SkThread.h"
+#include <cstring>
+
+SkLanguage SkLanguage::getParent() const {
+    SkASSERT(fInfo != NULL);
+    SkASSERT(fInfo->fTag != NULL);
+    const char* tag = fInfo->fTag.c_str();
+    SkASSERT(tag != NULL);
+
+    // strip off the rightmost "-.*"
+    char* parentTagEnd = strrchr(tag, '-');
+    if (parentTagEnd == NULL) {
+        return SkLanguage("");
+    }
+    size_t parentTagLen = parentTagEnd - tag;
+    char parentTag[parentTagLen + 1];
+    strncpy(parentTag, tag, parentTagLen);
+    parentTag[parentTagLen] = '\0';
+    return SkLanguage(parentTag);
+}
+
+SK_DECLARE_STATIC_MUTEX(gGetInfoMutex);
+const SkLanguageInfo* SkLanguage::getInfo(const char* tag) {
+    SkAutoMutexAcquire lock(gGetInfoMutex);
+
+    static const size_t kDictSize = 128;
+    static SkTDict<SkLanguageInfo*> tagToInfo(kDictSize);
+
+    // try a lookup
+    SkLanguageInfo* info;
+    if (tagToInfo.find(tag, &info)) {
+        return info;
+    }
+
+    // no match - add this language
+    info = new SkLanguageInfo(tag);
+    tagToInfo.set(tag, info);
+    return info;
+}
+
+#endif
diff --git a/src/core/SkPaint.cpp b/src/core/SkPaint.cpp
index e1932a7..fc5e57c 100644
--- a/src/core/SkPaint.cpp
+++ b/src/core/SkPaint.cpp
@@ -372,6 +372,10 @@ void SkPaint::setTextLocale(const SkString& locale) {
         GEN_ID_INC;
     }
 }
+
+void SkPaint::setLanguage(const SkLanguage& language) {
+    setTextLocale(SkString(language.getTag()));
+}
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////